CN105847353A - Mobile CDN (content delivery network) content scheduling method and system for mobile communication network - Google Patents
Mobile CDN (content delivery network) content scheduling method and system for mobile communication network Download PDFInfo
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- CN105847353A CN105847353A CN201610166439.0A CN201610166439A CN105847353A CN 105847353 A CN105847353 A CN 105847353A CN 201610166439 A CN201610166439 A CN 201610166439A CN 105847353 A CN105847353 A CN 105847353A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
Abstract
The invention provides a mobile CDN (content delivery network) content scheduling method and system for a mobile communication network. The method includes the following steps that: when receiving a first DNS resolution request of UE, an enhancement type base station (MeNB) injects the position identification information of the UE into the first DNS resolution request so as to obtain a second DNS resolution request; when receiving the second DNS resolution request, a local DNS server intercepts and captures the second DNS resolution request and forwards the second DNS resolution request or guides the second DNS resolution request to a load balance controller through a CName mode; and the load balance controller selects a CDN node deployed in the mobile communication network according to the position identification information in the second DNS resolution request and returns the IP address of the CDN node to the UE so that the UE can request content from the CDN node. With the method and system of the invention adopted, content requests of the UE can be precisely scheduled to a CDN node in a mobile core network, or even a radio access network (RAN), wherein the CDN node is closer to the UE, and therefore, precise scheduling of user requests under a mobile communication network condition can be realized.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of shifting towards mobile communications network
Dynamic CDN content dispatching method and system.
Background technology
Cisco has issued global ip stream statistics of variables and prediction address in February, 2016, and report is aobvious
Showing, from 2015 to the year two thousand twenty, the mobile data traffic in the whole world accounted for global ip flow and (includes fixed network
And mobile network) proportion will rise to 15% from 5%, its growth rate is the twice of fixed network.
And, within 2015, in mobile data traffic, video class flow occupies the proportion exceeding half
(55%), this shows that video class flow has already taken up most of flow in a mobile network,
And its accounting share is also further continued for increasing；Meanwhile, video class application due to its high flow capacity,
The particular/special requirements such as low delay, also propose to choose by the ability that mobile network is transmitted video class flow
War.
At present, content distributing network (Content Delivery Network, CDN) is to pass
An example extremely successful in numerous schemes of content distribution is carried out in system IP network.Tradition CDN system
In, scheduling feature mainly by GSLB (Global Server Load Balance,
GSLB) carry out, according to realizing the difference of principle, substantially can be divided into based on domain name system
System (Domain Name System, the DNS) GSLB that resolves and based on application layer protocol weight
The GSLB of orientation.
GSLB scheme based on dns resolution is that GSLB is deployed in DNS system, works as UE
When carrying out DNS query, return through the most suitable CDN node of intelligent decision directly to UE
IP.Common is achieved in that by CName mechanism, increases by one to domain name to be resolved
CName record, and this CName points to a domain name of GSLB accreditation.Domain name to be resolved
After name server obtains CName, will replace by the domain name that CName in record points to and look into
The domain name to be resolved looked for, then carries out the dns resolution of intelligence at GSLB to UE.Based on
The groundwork flow process of the GSLB of dns resolution is as shown in Figure 1.In FIG, content supplier
(CP) add a CName record to domain name www.cdn.com to be resolved, be allowed to refer to
To www.c.cdn.com, when resolving www.cdn.com, dns server finds that this domain name has
One CName points to www.c.cdn.com, the most just replaces with www.c.cdn.com
Www.cdn.com carries out domain name mapping, and the parsing to www.c.cdn.com exists just
Carrying out at GSLB, now GSLB carries out intelligently parsing to the DNS request of UE again, is adjusted by UE
Degree is to suitable CDN node.The benefit of this mode is to realize simply, it is not necessary to change public
The configuration of DNS system, is that current industry uses most modes.
It is exactly HTTP redirection that application layer protocol redirects modal, and its ultimate principle is profit
By the redirection conditional code in http protocol, the content that UE asks is redirect to another one
URL (address being scheduled for), its groundwork flow process as shown in Figure 2: UE passes through local
The when that DNS carrying out the parsing of domain name www.cdn.com, local DNS to what UE returned is
IP the address a.b.c.d, UE of GSLB is being sent to the HTTP request of content xyz.mp4
GSLB (a.b.c.d), GSLB, according to certain strategy, such as consider the position of UE, CDN
Load of node etc. selects a suitable node, replys 302 redirection responses to UE,
UE is redirected to certain CDN node (d.e.f.g), and it is right that UE sends to d.e.f.g the most again
The HTTP request of xyz.mp4.Certainly, in the system of some reality, CDN service provides
Business may also have secondary loads equilibrium (SLB), redirects to UE in above-mentioned 4th step
May be certain SLB, what UE asked in the 5th step is also this SLB, then by this SLB
Carry out choosing of next step node.
But, above-mentioned CDN content scheduling scheme, carry out content in being only applicable to tradition IP network
Distribution, for ambulant consideration, terminal its IP ground in moving process between different base station
Location (typically private address) keeps constant.Therefore, the IP address of mobile terminal can not
Represent the station location marker information of UE, which results in tradition CDN and carry out according to UEIP address
The mechanism of scheduling can not be applied to mobile network.
To sum up, a kind of mobile CDN content dispatching party towards mobile communications network how is provided
Method and system, to be precisely dispatched to the request of UE be positioned at mobile core network even wireless access
Distance UE of net (RAN) closer to CDN node, it is achieved tradition CDN ability to
Mobile communications network sinks, and is technical problem the most urgently to be resolved hurrily.
Summary of the invention
In view of the above problems, the present invention proposes a kind of mobile CDN towards mobile communications network
Content scheduling method and system, to realize the accurate tune of CDN under mobile communications network scene
Degree.
According to the first aspect of the invention, it is provided that a kind of movement towards mobile communications network
CDN content dispatching method, the method includes:
When enhanced base station MeNB receives the first dns resolution request of UE, described
First dns resolution request is injected the station location marker information of described UE, obtains the 2nd DNS
Analysis request；
When local dns server receives described second dns resolution request, by described the
Two dns resolution Request Interception are also forwarded or are guided to load balancing by CName mode
Controller；
Described load balancing controller is according to the position mark in described second dns resolution request
Knowledge information selects to be deployed in the CDN node of mobile communications network, and by described CDN node
IP address be back to UE, so that UE carries out content requests to described CDN node.
Wherein, described enhanced base station MeNB receives the first dns resolution request of UE
Time, described first dns resolution request is injected the station location marker information of described UE, enters
One step includes:
The station location marker information of described UE is added to the IP of described first dns resolution request
The Option field of heading；Or
In described first dns resolution request, extend existing DNS Protocol, at Additional
RRs region increases self-defining record, injects the station location marker information of described UE.
Wherein, when described local dns server receives described second dns resolution request,
By described second dns resolution Request Interception and be forwarded to load balancing controller, wrap further
Include:
Local dns server judges whether described second dns resolution request belongs to default
Service domain name；
If the determination result is YES, then by described second dns resolution Request Interception and be forwarded to bear
Carry balance controller.
Wherein, when described local dns server receives described second dns resolution request,
Described second dns resolution request is guided to load balancing controller by CName mode,
Farther include:
Local dns server identifies described second dns resolution request and through repeatedly passing
Return and reach GSLB controller afterwards；
Described GSLB controller is according to the position in described second dns resolution request
Put identification information described second dns resolution request to be guided to correspondence by CName mode
Secondary loads balance controller.
Wherein, described load balancing controller is marked according to the position in described second dns resolution
Knowledge information selects CDN node, farther includes:
Station location marker letter in second dns resolution described in described load balancing controller identification
Breath；
According to described station location marker information and CDN node scheduling strategy, obtain described CDN
The node identification of node；
Described CDN node scheduling strategy at least includes according to customer position information, CDN joint
Point load and/or link quality information select the strategy of described CDN node.
Wherein, described station location marker information at least includes belonging to UE own base station mark or UE
IP address, base station.
According to the second aspect of the invention, it is provided that a kind of movement towards mobile communications network
CDN content dispatching patcher, this system includes that enhanced base station MeNB, local dns take
Business device, load balancing controller and be deployed in the CDN node of mobile communications network；
Described enhanced base station MeNB, for asking in the first dns resolution receiving UE
When asking, described first dns resolution request is injected the station location marker information of described UE,
Obtain the second dns resolution request；
Described local dns server, for receiving described second dns resolution request
Time, by described second dns resolution Request Interception and forward or drawn by CName mode
It is directed at described load balancing controller；
Described load balancing controller, for according to the position in described second dns resolution request
Put identification information and select CDN node, and the IP address of described CDN node is back to
UE, so that UE carries out content requests to described CDN node.
Wherein, described enhanced base station MeNB, specifically for marking the position of described UE
Knowledge information adds the Option field of the IP heading of described first dns resolution request to；
Or in described first dns resolution request, extend existing DNS Protocol, at Additional
RRs region increases self-defining record, injects the station location marker information of described UE.
Wherein, described local dns server, specifically for judging that described 2nd DNS solves
Whether analysis request belongs to default service domain name；If the determination result is YES, then by described second
Dns resolution Request Interception is also forwarded to load balancing controller.
Wherein, described local dns server, specifically for identifying described 2nd DNS
Analysis request also reaches GSLB server after repeatedly recurrence, so that described
GSLB controller is according to the station location marker information in described second dns resolution request
Described second dns resolution request is guided to corresponding secondary loads by CName mode
Balance controller.
The invention have the benefit that
The present invention provide the mobile CDN content dispatching method towards mobile communications network with
System, by using enhanced base station MeNB in the dns resolution receiving UE is asked
Injecting the station location marker information of UE, local dns server will carry station location marker information
Dns resolution request forward or guide to load balancing controller, load balancing controller
The CDN node of mobile communications network it is deployed according to station location marker information searching, and by CDN
The IP address of node sends to UE, so that UE carries out content requests by this CDN node.
It is the most wireless that the content requests of UE can be precisely dispatched to be positioned at mobile core network by the present invention
The CDN node of access network (RAN), it is achieved the ability of tradition CDN is to mobile radio communication
Network sinks, it is achieved the accurate scheduling of CDN under mobile communications network scene, promotes user's body
Test.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit
Those of ordinary skill in the art be will be clear from understanding.Accompanying drawing is only used for illustrating and is preferable to carry out
The purpose of mode, and it is not considered as limitation of the present invention.And in whole accompanying drawing, use
Identical reference marks represents identical parts.In the accompanying drawings:
Fig. 1 is the basic flowchart of GSLB based on dns resolution in background technology；
Fig. 2 be in background technology based on application layer protocol redirect GSLB substantially realize stream
Cheng Tu；
Fig. 3 is the present invention network towards the mobile CDN content dispatching patcher of mobile communications network
Topological diagram；
In Fig. 4 is the mobile CDN towards mobile communications network that one embodiment of the invention proposes
Hold the flow chart of dispatching method；
In Fig. 5 is the mobile CDN towards mobile communications network that one embodiment of the invention proposes
Hold the basic flowchart of dispatching method；
In Fig. 6 is the mobile CDN towards mobile communications network that another embodiment of the present invention proposes
Hold the basic flowchart of dispatching method；
Fig. 7 is that the mobile CDN content towards mobile communications network that the embodiment of the present invention proposes is adjusted
The actual application scenarios schematic diagram of degree method.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the accompanying drawings
Going out, the most same or similar label represents same or similar element or has phase
With or the element of similar functions.The embodiment described below with reference to accompanying drawing is exemplary,
It is only used for explaining the present invention, and is not construed as limiting the claims.
For realizing the accurate scheduling of CDN under mobile communications network scene, the embodiment of the present invention carries
A kind of mobile CDN content dispatching method towards mobile communications network and system are supplied.At this
In embodiment, introduce the four new network elements of class, as it is shown on figure 3, be MSLB (Mobile Server respectively
Load Balance)、MeNB(Mobile eNodeB)、MCN(Mobile Content Node)
With MLDNS (Mobile Local Domain Name Server), wherein:
MSLB is deployed in mobile gateway P-GW (Packet data by the way of bypass
Network Gateway) rear side, as controller, it is responsible for the request to UE mobile network
Inside is scheduling；
MeNB is the eNB of enhancement mode, and the dns resolution of UE equipment UE can be asked by it
Seek the station location marker information injecting UE.The station location marker information of UE may include but be not limited to
Under several: UE own base station mark (Cell ID), UE own base station IP address, UE institute
Belong to MCN mark, MCN correspondence MSLB mark belonging to UE.The UE injected at MeNB
Station location marker information can be above-mentioned a certain information or comprise several information simultaneously；
MCN is the CDN node being deployed in mobile access network.Dispose by the way of bypass
On rear side of MeNB, the most each MCN node is by the router/switch being connected with MeNB
Access mobile edge network, utilize mobile access network and return network physical link to lead to
Letter.MCN can be that one or more MeNB provides content service.
MLDNS is the home domain name resolution server Local of enhancement mode in mobile CDN
DNS, it is that it can identify MeNB in place of the main difference of common Local DNS
The station location marker information injected in the dns resolution of UE is asked, and making iterative queries into
When these station location marker information are carried transmission.
It will be appreciated that in actual deployment, some UE accesses mobile by MeNB
Network, also some UE is accessed by common eNB.
Fig. 4 shows the mobile CDN content towards mobile communications network of the embodiment of the present invention
The flow chart of dispatching method.
With reference to Fig. 4, the mobile CDN towards mobile communications network that the embodiment of the present invention proposes
Content scheduling method specifically includes following steps:
Step S11, enhanced base station MeNB receive the first dns resolution request of UE
Time, described first dns resolution request is injected the station location marker information of described UE,
To the second dns resolution request.
When step S12, local dns server receive described second dns resolution request,
By described second dns resolution Request Interception and forward or guided to negative by CName mode
Carry balance controller.
Step S13, described load balancing controller are according in described second dns resolution request
Station location marker information select to be deployed in the CDN node of mobile communications network, and by described
The IP address of CDN node is back to UE, so that UE carries out content to described CDN node
Request.
The mobile CDN content towards mobile communications network that the embodiment of the present invention provides is dispatched
Method, by using enhanced base station MeNB in the dns resolution receiving UE is asked
Injecting the station location marker information of UE, local dns server will carry station location marker information
Dns resolution request be forwarded to load balancing controller, load balancing controller is according to position
Identification information searches the CDN node being deployed in mobile communications network, and by CDN node
IP address sends to UE, so that UE carries out content requests by this CDN node, and then
Realize precisely being dispatched to be positioned at mobile core network even wireless access network by the content requests of UE
(RAN) CDN node, it is achieved the ability of tradition CDN is sunk to mobile communications network,
Realize the accurate scheduling of CDN under mobile communications network scene.
In the embodiment of the present invention, the enhanced base station MeNB in step S11 receives UE's
During the first dns resolution request, in described first dns resolution request, inject described UE's
Station location marker information, farther includes in the following drawings as the step illustrated:
Step S111, the station location marker information of described UE is added to described oneth DNS solve
The Option field of the IP heading of analysis request；Or
Step S112, described first dns resolution request in, extend existing DNS Protocol,
Increase self-defining record in Additional RRs region, such as: the cell ID of base station or
IP address etc., and in self-defining record, inject the station location marker information of described UE.
In actual applications, the specific implementation of the station location marker information of MeNB injection UE
May include but be not limited to two categories below:
The first, the Option field of IP stem (IP Header) is utilized.Please in dns resolution
The option field of the IP heading asked adds the station location marker of the self-defining UE of MeNB
Information.In this case, need can support to identify IP datagram option at MLDNS
Station location marker information in field.
The second, extension DNS request.DNS request is allowed to possess the station location marker letter carrying UE
The ability of breath, this scheme mentions at present in the draft of IETF the most in a organized way, such as Google
The client-subnet submitted to, existing DNS Protocol is extended by this draft so that UE
Station location marker information can send as a part for DNS request.At present
OpenDNS and Google Public DNS has supported this agreement the most.But due to mobile communication
IP address in network cannot direct routing, therefore cannot say existing client-subnet
Agreement is directly used in mobile network.In the case, this programme extends existing DNS Protocol,
The information such as cell ID or the IP address of carrying base station in Additional RRs region, MeNB
When receiving the dns resolution request that a UE end sends, need to take following steps:
In the DNS request of UE, inject according to the extension DNS Protocol that this programme proposes
The station location marker information of UE, now needs MLDNS also can support this Extended Protocol；
MeNB mails to MLDNS the dns resolution request propagated through.
In an alternate embodiment of the present invention where, during step S12 farther includes the following drawings
Unshowned step:
Whether step S121, local dns server judge described second dns resolution request
Belong to default service domain name；
Step S122, if the determination result is YES, then by described second dns resolution Request Interception
And it is forwarded to load balancing controller.
The basic thought of the scheduling mode that the embodiment of the present invention provides is needing at MLDNS
The dns resolution request interception of intelligently parsing domain name to be carried out is got off, and is sent to MSLB and carries out
Resolve, whether accessed MeNB according to UE and illustrated its flow process respectively:
Firstly, for having accessed the UE of MeNB, as it is shown in figure 5, the place of its content requests
Reason logic is as follows:
Step 1, the dns resolution of UE1 are asked through MeNB, and MeNB is at request message
The station location marker information of middle injection UE；
Step 2, MeNB send out the dns resolution request of the station location marker information being filled with UE
Toward MLDNS；
Step 3, MLDNS find this domain name in MCDN service-domain list of file names, (such as
May determine that and include but not limited to whether request has the station location marker information of UE and whether purchases
Buy MCDN service), intercept this request, this request is transmitted to MSLB, carries simultaneously
Station location marker information in step 1；
Step 4, MSLB identify the station location marker information in this dns resolution request, enter
Row intelligently parsing, it is assumed herein that return the IP address of MCN1 to UE；
Step 5, UE send HTTP request to MCN1, obtain content.
Additionally, for the UE accessing common eNB, handling process is as follows:
Step 6, UE2 dns resolution request through eNB, eNB unimplanted UE
Station location marker information；
Step 7, MLDNS receive the dns resolution request of UE, find that this domain name does not add
Enter MCDN service, then go Global CDN to carry out conventional dns resolution operation；
Step 8 is it is assumed herein that conventional resolution flow process returns the address of certain CP to UE；
Step 9, UE remove request content at CP.
The embodiment of the present invention, the domain name mapping request dispatched in needs can be moved net is concentrated
Process at MSLB, not with mobile network outside DNS system produce contact.
In another alternative embodiment of the present invention, step S12 farther includes in the following drawings
Unshowned step:
Step S121 ', local dns server identify described second dns resolution ask also
GSLB server is reached after repeatedly recurrence；
Step S122 ', described GSLB controller is according to described second dns resolution
Described second dns resolution request is drawn by the station location marker information in request by CName mode
It is directed at the secondary loads balance controller of correspondence.
The basic thought of the scheduling mode that the embodiment of the present invention provides is by changing Global
The behavior of GSLB in CDN so that GSLB can recognize that the dns resolution request of UE
In station location marker information, and then according to station location marker information, domain name to be resolved is directed to
Resolving at MSLB, idiographic flow is as follows:
Firstly, for the UE being connected under MeNB, as shown in Figure 6, the place of its content requests
Reason logic is as follows:
Step 1, the dns resolution of UE1 are asked through MeNB, and MeNB is at request message
The station location marker information of middle injection UE；Then MLDNS is mail in this dns resolution request；
Step 2, MLDNS identify in this dns resolution request and comprise within mobile network
Station location marker information, replaces UE to carry out recursive query, above-mentioned station location marker information during inquiry
Re-inject and ask into dns resolution；
Step 3, the dns resolution request always arrival of MLDNS after repeatedly recurrence
First order GSLB, GSLB judges whether include mobile network's interior location mark in this request
Knowledge information.If having, then continue to translate domain names into according to this station location marker information to pass through CName
Mode be directed to the MSLB that this station location marker information is corresponding, now this MSLB is i.e. two
The SLB of level；
The MSLB that step 4, MLDNS are corresponding in step 3 sends dns resolution request,
The station location marker information of above-mentioned UE it has been also injected in this dns resolution request；
Step 5, step 3 MSLB according to the station location marker information of UE, determine UE
It is dispatched to most suitable MCN node, i.e. returns to the IP address of suitable MCN node, herein
Assume that return is the IP address of MCN1.
Step 6, the UE MCN1 node in step 5 sends HTTP request and obtains content；
Additionally, for being connected on the UE under common eNB, its dns resolution is asked through eNB
Shi Bingwei is injected into station location marker information, and handling process is as follows:
Step 7, UE request reaches MLDNS through eNB；
Step 8, MLDNS find not have in this request the station location marker within mobile network
Information, replaces UE to carry out the DNS recursive query of routine, and last solution separates out a CP's
IP address；
The IP address of the CP that step 9, UE obtain in step 8 sends HTTP request,
Obtain content.
In embodiments of the present invention, the load balancing controller in step S13 is according to described second
Station location marker information in dns resolution selects CDN node, farther includes in the following drawings
Unshowned step:
Position in second dns resolution described in step S131, described load balancing controller identification
Put identification information；
Step S131, according to described station location marker information and CDN node scheduling strategy, obtain
The node identification of described CDN node；Wherein, described CDN node scheduling strategy at least wraps
Include and select described according to customer position information, CDN node load and/or link quality information
The strategy of CDN node.
Wherein, station location marker information at least includes UE own base station mark or UE own base station
IP address.
In actual applications, inject in the dns resolution request message of UE at MeNB
The station location marker information of UE, it may include but it is not limited to following several: UE own base station identifies
(Cell ID), UE own base station IP address, MCN mark belonging to UE, MCN belonging to UE
Corresponding MSLB mark.The station location marker information of UE injected at MeNB can be above-mentioned certain
A kind of information or simultaneously comprise several information, those skilled in the art can be according to actual applied field
Scape is configured, and this is not especially limited by the present invention.
In the embodiment of the present invention, by mapping relations at load balancing controller MSLB
Mode, safeguards have the internal MCN node of mobile network and base station (including MeNB and eNB)
Between attaching relation, and then (include according to the internal MCN node of mobile network and base station
MeNB and eNB) between attaching relation, obtain MCN node node identification, and then
Find the CDN node of optimum.
Below by a specific embodiment, inventive technique scheme is carried out detailed explanation.
Under scene as shown in Figure 7, the cell id of MeNB is 1, and the mark of MCN is divided
Other 2 and 5, MSLB are designated 3, in the embodiment of the present invention, it is not necessary to obtain MeNB's
IP address.Intelligible, the IP address of MeNB can also be added in actual deployment.
When the UE being designated 6 have issued a dns resolution request under MeNB (being designated 1),
We are referring initially to the flow process under DNS interception scene:
MeNB is injection phase identification information 1-2-3 in the dns resolution of UE is asked, and will
Request is sent to MLDNS；
MLDNS identifies in this dns resolution request Z and includes station location marker information, i.e.
The domain name that DNS request resolves has added mobile CDN service, then intercept this request, should
Request sends to MSLB；
MSLB reads station location marker information 1-2-3 in this request it is known that base belonging to UE
The ID that stands is 1, and the ID of MCN corresponding to base station that ID is 1 is 2, then return to UE
Go back to the IP address of the MCN that ID is 2；
UEID be 2 MCN send HTTP request, obtain content
In the case of coordinating with Global CDN, flow process is as follows:
MeNB is injection phase identification information 1-2-3 in the dns resolution of UE is asked, and says
Request is sent to MLDNS；
MLDNS carries out recurrence dns resolution request, is carried by UE during recurrence
The station location marker information of 1-2-3 is also carried, and eventually recurrence is to GSLB；
GSLB identifies station location marker information 1-2-3 in this request it is known that belonging to UE
The ID of MSLB is 3, then, by the way of CName, domain name to be resolved handed to
MSLB resolves；
After MSLB have received the dns resolution request of UE, read station location marker information
1-2-3 is it is known that UE own base station ID is 1, and the ID of affiliated MCN is 2, returns to UE
Return the MCN that ID is 2；
UE sends HTTP request to the MCN that ID is 2, obtains content.
The mobile CDN content dispatching party towards mobile communications network that the embodiment of the present invention provides
Method, compared with the DNS scheduling mode in existing fixed network CDN system, has the advantage that
The expression side of the station location marker information of UE in the mobile network proposed in the embodiment of the present invention
Method, it is possible to preferably identify the station location marker information of UE in mobile network.
The mobile CDN content towards mobile communications network proposed in the embodiment of the present invention is dispatched
Method, dispatches more accurate.In existing fixed network, GSLB is according to UELocal DNS
(IP address) is scheduling, but Local DNS can not represent the position of UE exactly
Putting, in the embodiment of the present invention, the station location marker information according to UE self is scheduling, permissible
Improve the accuracy of scheduling, thus improve the experience of UE.
For embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of action
Combination, but those skilled in the art should know, and the embodiment of the present invention is not by described
The restriction of sequence of movement, because according to the embodiment of the present invention, some step can use other suitable
Sequence or simultaneously carry out.Secondly, those skilled in the art also should know, is retouched in description
The embodiment stated belongs to preferred embodiment, and the involved action not necessarily present invention implements
Necessary to example.
Additionally, the embodiment of the present invention additionally provide a kind of movement towards mobile communications network
CDN content dispatching patcher, this system includes enhanced base station MeNB, local dns service
Device, load balancing controller and be deployed in the CDN node of mobile communications network；
Described enhanced base station MeNB, for asking in the first dns resolution receiving UE
When asking, described first dns resolution request is injected the station location marker information of described UE,
Obtain the second dns resolution request；
Described local dns server, is used for when receiving described second dns resolution request,
By described second dns resolution Request Interception and forward or guided to institute by CName mode
State load balancing controller；
Described load balancing controller, for according to the position in described second dns resolution request
Put identification information and select CDN node, and the IP address of described CDN node is back to
UE, so that UE carries out content requests to described CDN node.
In embodiments of the present invention, described enhanced base station MeNB, specifically for by described
The station location marker information of UE adds the IP heading of described first dns resolution request to
Option field；Or in described first dns resolution request, extend existing DNS Protocol,
Increase self-defining record in Additional RRs region, such as: the cell ID of base station or
Person IP address etc., and in self-defining record, inject the station location marker information of described UE.
In embodiments of the present invention, described local dns server, described specifically for judging
Whether the second dns resolution request belongs to default service domain name；If the determination result is YES, then
By described second dns resolution Request Interception and be forwarded to load balancing controller.
In embodiments of the present invention, described local dns server, specifically for identifying
State the second dns resolution request and after repeatedly recurrence, reach GSLB service
Device, so that described GSLB controller is according in described second dns resolution request
Described second dns resolution request is guided to right by station location marker information by CName mode
The secondary loads balance controller answered.
For system embodiment, due to itself and embodiment of the method basic simlarity, so describing
Fairly simple, relevant part sees the part of embodiment of the method and illustrates.
In sum, the mobile CDN towards mobile communications network that the embodiment of the present invention provides
Content scheduling method and system, by using enhanced base station MeNB receiving UE's
Injecting the station location marker information of UE in dns resolution request, local dns server will carry
The dns resolution request having station location marker information forwards or guides to load balancing controller,
Load balancing controller is deployed in the CDN of mobile communications network according to station location marker information searching
Node, and the IP address of CDN node is sent to UE, so that UE is saved by this CDN
Point carries out content requests.The content requests of UE can be precisely dispatched to be positioned at movement by the present invention
The CDN node of core net even wireless access network (RAN), it is achieved the energy of tradition CDN
Power is sunk to mobile communications network, it is achieved the accurate tune of CDN under mobile communications network scene
Degree.
Through the above description of the embodiments, those skilled in the art it can be understood that
Can be realized by hardware to the present invention, it is also possible to add the general hardware platform of necessity by software
Mode realize.Based on such understanding, technical scheme can be with software product
Form embody, this software product can be stored in a non-volatile memory medium (can
To be CD-ROM, USB flash disk, portable hard drive etc.) in, including some instructions with so that one
Platform computer equipment (can be personal computer, server, or the network equipment etc.) performs
Method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, attached
Module or flow process in figure are not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be according to reality
Execute example description to carry out being distributed in the device of embodiment, it is also possible to carry out respective change and be positioned at difference
In one or more devices of the present embodiment.The unit of above-described embodiment can merge into one
Unit, it is also possible to be further split into multiple submodule.
The above is only the some embodiments of the present invention, it is noted that lead for this technology
For the those of ordinary skill in territory, under the premise without departing from the principles of the invention, it is also possible to make
Some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. towards a mobile CDN content dispatching method for mobile communications network, its feature
Being, the method includes:
When enhanced base station MeNB receives the first dns resolution request of UE, described
First dns resolution request is injected the station location marker information of described UE, obtains the 2nd DNS
Analysis request；
When local dns server receives described second dns resolution request, by described the
Two dns resolution Request Interception are also forwarded or are guided to load balancing by CName mode
Controller；
Described load balancing controller is according to the position mark in described second dns resolution request
Knowledge information selects to be deployed in the suitable CDN node of mobile communications network, and by described CDN
The IP address of node is back to UE, so that UE carries out content requests to described CDN node.
Method the most according to claim 1, it is characterised in that described enhanced base station
When MeNB receives the first dns resolution request of UE, in described first dns resolution
Request is injected the station location marker information of described UE, farther includes:
The station location marker information of described UE is added to the IP of described first dns resolution request
The Option field of heading；Or
In described first dns resolution request, extend existing DNS Protocol, at Additional
RRs region increases self-defining record, injects the station location marker information of described UE.
Method the most according to claim 1, it is characterised in that described local dns
When server receives described second dns resolution request, please by described second dns resolution
Ask intercepting and capturing and be forwarded to load balancing controller, farther including:
Local dns server judges whether described second dns resolution request belongs to default
Service domain name；
If the determination result is YES, then by described second dns resolution Request Interception and be forwarded to bear
Carry balance controller.
Method the most according to claim 1, it is characterised in that described local dns
When server receives described second dns resolution request, please by described second dns resolution
Ask and guided to load balancing controller by CName mode, farther include:
Local dns server identifies described second dns resolution request and through repeatedly passing
Return and reach GSLB server afterwards；
Described GSLB controller is according to the position in described second dns resolution request
Put identification information described second dns resolution request to be guided to correspondence by CName mode
Secondary loads balance controller.
Method the most according to claim 1, it is characterised in that described load balancing control
Device processed selects CDN node according to the station location marker information in described second dns resolution, enters
One step includes:
Station location marker letter in second dns resolution described in described load balancing controller identification
Breath；
According to described station location marker information and CDN node scheduling strategy, obtain described CDN
The node identification of node；
Described CDN node scheduling strategy at least includes according to customer position information, CDN joint
Point load and/or link quality information select the strategy of described CDN node.
Method the most according to any one of claim 1 to 5, it is characterised in that institute
Rheme is put identification information and is at least included UE own base station mark or UE own base station IP address.
7. towards a mobile CDN content dispatching patcher for mobile communications network, its feature
Being, this system includes enhanced base station MeNB, local dns server, load balancing
Controller and be deployed in the CDN node of mobile communications network；
Described enhanced base station MeNB, for asking in the first dns resolution receiving UE
When asking, described first dns resolution request is injected the station location marker information of described UE,
Obtain the second dns resolution request；
Described local dns server, for receiving described second dns resolution request
Time, by described second dns resolution Request Interception and forward or drawn by CName mode
It is directed at described load balancing controller；
Described load balancing controller, for according to the position in described second dns resolution request
Put identification information and select CDN node, and the IP address of described CDN node is back to
UE, so that UE carries out content requests to described CDN node.
System the most according to claim 7, it is characterised in that described enhanced base station
MeNB, specifically for adding the station location marker information of described UE to a described DNS
The Option field of the IP heading of analysis request；Or please in described first dns resolution
In asking, extend existing DNS Protocol, increase self-defining note in Additional RRs region
Record, injects the station location marker information of described UE.
System the most according to claim 7, it is characterised in that described local dns
Server, specifically for judging whether described second dns resolution request belongs to default service
Domain name；If the determination result is YES, then by described second dns resolution Request Interception and be forwarded to
Load balancing controller.
System the most according to claim 7, it is characterised in that described local dns
Server, specifically for identify described second dns resolution request and through repeatedly recurrence it
After reach GSLB server, so that described GSLB controller is according to institute
The station location marker information in the second dns resolution request of stating is by described second dns resolution request
Guided to corresponding secondary loads balance controller by CName mode.
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| US11689496B2 (en) | 2019-08-20 | 2023-06-27 | Huawei Technologies Co., Ltd. | Domain name system query method and communication apparatus |
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